No issue with audio. I have played a lot. Do you use RetroArch directly from the Steam store (which I do) or through something like EmuDeck or RetroDeck maybe? In that case, it is possible that the issue lies somewhere there. Just noticed RetroArch app got finally a "Verified" status. Check if you set it to mute by accident. As for my RetroArch, in the sub menu of Settings > Audio > Output:

Audio = ON
Audio = pulse
Device = Default
Output Rate (Hz) = 48000
Audio Latency (ms) = 64
Audio Resampler = sinc
Resampler Quality = Normal

I'm not saying these are the optimal settings, just my current settings that work for me. Check those settings, change and restart RetroArch to test.